1 Land contracts or contracts for deed are a security agreement between a seller, called a Vendor, and a buyer, called a Vendee.  The Vendor agrees to sell a property by financing the purchase for the Vendee.
The two DNA strands are held together by interchain hydrogen bonds. H-bonds pair the bases in one chain to the complementary bases in the other chain. (A/T and G/C).
When complementary sequences of base pairs on opposing DNA strands are aligned, hydrogen bonds form between positively charged hydrogen atoms and negatively charged oxygen atoms within the structure of the base pairs. These hydrogen bonds add additional stability to the DNA double helix.